Indication-transmitting apparatus.



J. PEREPELKIN.. lNDlCATlON TRANSMITTING APPARATUS. I APPLICATION FILEDFEB- 23,1912. RENEWED JULY 7. I91?- 1,23 ,97 Patented Aug. 14,1917,

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J. PEREPELKIN. iNDICATION TBANSMITTING APPARATUS. APPLICATION FILED FEB.23. m2. RENEWED JULY 7. I917. 1,236,976.

Patented Aug. 14, 1917.

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//3 [/YVE/YT'OF? AZZ -J. PEREPELKIN. mole/Anon TRANSMITTING APPARATUS.APPLICATION FILED FEB- 23. 192. RENEWED JULY 7. 1917. 1,236,976 PatentedAug. 14, 19.17.

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H m .A m 4, m1 4, 4 a s 8 0 mm a d m a a DAME of 6 m 0 y W/ h #2 M a a 0u a a m w 9 6 0 2 z 22 3 a y 5 1 F 5 IL 3 I. PERI-IPELKIN.-- INDICATIONTRANSMITTING APPARATUS. APPLICATION FILED mmza} 1912. RENEWED IULY Illllll N -IIIIIIIII "UNITED srn'rns PATENT onmon.

JACOB PEREIPELKIN, OF PETROGRAD, RUSSIA.

INDICATION-TRANSMITTING APPARATUS.

Application filed February 23, 1912, Serial No. 6793605.

To all whom it may concern.

Be it known that I, JACOB PEREPELKIN, a subject of the Emperor ofRussia, and a resident of Petrograd, Russia, have invented certain newand useful Improvements in Indication -Transmitting Apparatus, of whichthe following is a specification.

This invention relates to apparatus for transmitting to a distanceindications of the operative positions assumed by various devices, forexample positions assiuned from time to time by a ships rudder, andwhich apparatus is of the kind comprising a transmitting device and oneor more receiving devices.

It consists in improved construction and arrangement of parts, theprincipal object of which is that the finger or indicator of a receivershall not be caused to indicate falsely by reason of casual vibrationsor shocks, that is to say, the reading by the indicator at the receivershould be changed only when caused to be so by the operation of thetransmitter.

To this end, means are provided whereby the shaft of theelectro-magnetic motor employed at the receiving apparatus for movingthe indicator thereof, is unable to turn during casual vibrations unlessit is actuated by means under the control of the transmitter.

According to this invention, the coils of the electro-magnetsconstituting parts of the motor are arranged to be always under theinfluence of an electric current with their armatures attracted andconsequently the circuits of the coils closed until such time as a keyof the transmitter is turned in one or other direction so that one orother of the said circuits is opened. The object of this arrangement isthat the motor shaft may be retained in a locked position as long as thesaid circuits are closed and the armatures attracted. It is alsoarranged that this period of open circuit shall be as small as possibleand be adjustable for the proper operation of the mechanism, and'thatthe reading indicated at the receiving device should change to theextent of only one division on the graduated dial associated with thereceiver indicator, when the key shaft at the transmitter makes a fullrota-' tion in either direction independently of any casual position itmay have. The parts of the transmitting and receiving apparatus areconstructed and arranged to operate in Specification of Letters Patent.

Patented A11 14, 1917.

Renewed July 7, 1917. Serial No. 179,238.

a manner that the above objects may be attained.

In order that the coils of the electromagnetic motor may not be of largedimensions, it is arranged according to this invention, that theirwindings should be fed, when the associated armatures are in the normalattracted position, with the weakest possible current, while, after anarmature has been withdrawn and the motor shaft is to be turned inconsequence of the attraction of the armature to operate the indicatingmechanism of the receiving apparatus, the windings should be fed with apowerful current. For this purpose each coil may consist of twowindings, one of which only is brought into circuit periodically after acircuit has been broken by the operation of the transmitter key and thearmature corresponding with that circuit is to be again attracted andthe motor shaft, through pawl and ratchet mechanism, turned.

On the accompanying drawings, Figure 1 represents diagrammatically theconnections between a manually operated transmitting device and areceiving device; Figs. 2, 3, and 4: show elevations, and Fig. 5 a planview of the transmitting device; Figs. 6, 7, 8 and 9 show variouspositions assumed by parts of the mechanism correlated with the key orcontroller of the transmitter during one turn of its axle; Figs. 6 and 6are views of the key or controller and of parts associated therewith;Figs. 10,- 11 and 12 show various views of the electro-magnetic motor ofthe receiver; Fig. 13 represents a diagram of the connection of atransmitting device A with several receiving devices B, C, D and E; Fig.13 shows a portion of Fig. 13 drawn to an enlarged scale and Fig. 14 isa diagram representing the automatic transmission to a distance ofindications of the position of an operated device, a rudder for example.

The key or controlling member of the transmitting device comprises thehollow shaft 1 (Figs. 3 and 4) which can rotate in the bearings of thebrackets 3 and a. A handle 2 may be set on the left end of it, or thisshaft may be connected by means of a suitable mechanical transmission,with the operated device, the indications of the positions assumed bywhich have to be automatically transmitted a certain distance away.

Y of a clock.

A disk (Figs. 2 and 3) is fastened on-the right end of the shaft 1,which disk has on it a small cam 7, oscillating freely onthe axle 6; aspring strip 8, between the points a and b (Fig. 7), insulated from thedisk; two spring strips 9 and 10 between the points e and 7 and thepoints 0 and (Z respectively.

These spring strips are insulated from one another and from the disk 5with insulating packing 13, 14 and 15 (Figs. 3, 6 and 6 and fastened tothe disk with insulating screws 16. Wires 17, 18 and 19 from each ofthese strips (Figs. 6, 6, 6 and 7) respectively run to rings 32, 33 and34 (Fig. 3), fastened on the shaft 1 and insulated from the shaft, aswell as from one another by means of the rings 20, 21, 22 and 23.Through rubbing contacts (Figs. 3 and 4) and spring blades 24, 25, 26,the rings 32, 33 and 34 are connected with the clamps 71 from which thewires 35, 36 and 37 run. The springs 24, 25 and 26 are insulated fromone another and from the key body, to which they are fastened by meansof insulated screws 27, 28 and 29.

The free ends of the spring strips 9 and 10 carry an insulated part 38(Fig. 3). The strips 9 and 10 are adapted to be electrically connectedwith the strip 8 through the contacts 11 carried by strip 8 and contacts12 carried by strips 9 and 10, as shown in Figs. 3, 6 and 6 and 7.

On the rotation of the shaft 1, the cam 7 enters the space between thestrips 8 and 9 or between the strips 10 and 8, dependent on thedirection of the rotation of the key or handle 2. In the drawingsrotation is assumed to be in the direction of the hands The roller 49(Figs. 3 and 6) will force the cam to occupy the position shown in Fig.7. Atthe same time the plate 10 will bear on the cam with its insulatedpart 38, which part the cam will move outward and disconnect its contact12 from the contact 11 of the plate 8.

A lever 41, fastened on the key body and having a weight on its leftend, adjustably held by a screw can oscillate freely on the axle 39(Fig. The other end 44 of the lever is drawn downward by a spring 45,adjustable by a screw 46, passing througi the lug 47 of the key body,and nuts 48. The abutment 51 provided with the insulated rubber piece52, limits the movement of the lever 41.

In upper bearings of the key body is an axle 54 (Fig. 4), to which isfastened by one of its ends a spiral spring 55; the other end of thespring is fastened with the screw 56 to the key body. The spring 55 ismounted in a somewhat wound state, dependent on the required adjustmentof the transmitter and thus always tends to turn the axle 54 with thesmall fly wheel 53, while a small cam or tappet carried by the wheel 53has a tendency the plates 9 and 10 (Figs. 1, 6 and 7).

to move upward against the pin of lever 41. A drum 57 (l igs. 4, 5 and6), made of insulating mat-eriahris also fastened on the axle 54; itcarries a metallic plate or segment 5S. Rubbing contact brushes 59 59bear on the surface of the drum 57, said brushes being adjustable bymeans of screws 64 (in Fig. 1 to make the matter more clear, two plates58 and 58 are shown, connected by a pin 103) on springs 60 60, fastened,through insulating plates 61 and 62 and screws 63, to the body of thetransmitter (Fig. 4).

The screws 65 serve as clamps for the wires 67 and 68. The wires 67G8(Fig. 1) are connected with the wires 35 and 37 (Figs. 1 and 3), whichare in their turn connected with the wires 19 and 17 from The wire 36 isconnected. with the wire 18 from the plate 8.

In Fig. 1 it is seen, that the wires 35 and 37 run to the windings ofthe coils of the electro-magnetic motor of the receiving apparatus. Thewire 36, runs through the source of electricity 7 0 to the common wire82 which connects the other ends of the same windings.

The shaft of the hereinafter described I electromagnetic motor isconnected with the finger or some other indicatr of the receivingapparatus. It is extremely important, that the indications of thereceiving apparatus should not be wrongly indicated during casualvibrations; to obviate this it is necessary that the shaft of the motorof the receiver should not be able to turn during casual vibrationsunless it is actuated by the transmitting device. It is necessary forthis purpose, that the coils of the electro-magnets should always beunder the influence of an electric current and that their armaturesshould always be attracted.

Therefore the transmitter key must be arranged in such a way, thatindependently of the casual position of the shaft 1, the circuit of thecoils of the electro-magnets of the receiving motor should always beclosed. At the same time, on the rotation of the key axle 1, dependenton the direction of rotation, the circuit must be cut off in the rightor left windings of the motor, 2'. 0., in wires 35 or 37. The stoppageof the current must be as short a period as possible, just sufficientfor the armature of the corresponding electroanagnet to have time towithdraw to its upper position and catch a tooth of the ratchet wheelwith its pawl before the cir cuit is again closed. The third conditionis that the locking and unlocking of the circuit should take place onceonly during a revolution of the shaft 1. In other words, it isnecessary, that the reading of the receiving device should change to theextent of one division on its graduated dial as the shaft 1 makes onefull revolution in either direction, independent of any casual positionof it. p

Fig. 1 corresponds to the position of the key shown in Fig. 6. Thecircuit of the right windings oft-he motor will be S38281 -7 57 97 837 7210 8187336-70.

The circuit of the left windings :7083 S29493 77 92 9 13 5104-98 7 3-367O. r

The circuits of both the electro-magnets are closed, the armatures areattracted and the shaft of the motor is locked.

If a rotation of the axle 1 of the key becommenced, say in the directionof the movement of the hands of a clock, the disk 5 will also rotatewith it. hen the cam '7 comes up to the roller 49 (Fig. 7) this latterwill force it to enter the space between the plates 10 and 8 which areinsulated from the cam. The contact between the contacts 1112 willbecome broken. The plate 10 will occupy the position shown in Fig. 1 indotted lines. In this position the course of the current of the leftcircuit will be the same as before and in the right one it will be asfollows:- 70 S 382f81 -807579783772 176860' 59581035859-6067191049818-73 36-70.

As before, the right circuit will be closed, but not through plates 108,as previously, but through the brushes 59 and the contact 'plate 58. 35

On a further rotation of the key axle the position shown in Fig. 8 willbe attained. The cam 7 enters the space between the plates 108 only tosuch an extent, as the projecting part 69 of the disk 5 will allow. Onthe rotation of the disk 5the cam 7 abutting against the roller 49,mounted on the lever 41, will commence to raise this latter. The flywheel 53, under the influence of the spiral spring 55, follows thefinger 50 on the lever 41 with its'cam 40. In Fig. 8 is shown theextreme position of the lever41,

just before the moment when the end of the cam 7, on the furtherrotation of the axle 1, frees itself from the roller 49. Up to thatmoment the right circuit is still closed, the plate 58 and brushes 59are still just in contact. As soon as the end of the cam 7 is free ofthe roller 49 (Fig. 9) the spring 45 'will at once rapidly lower thelever 41,

which will, with its finger 50, strike the tappet 40, whereupon theflywheel 53 together with its axle 54 and drum 57 will turn inconsequence of the blow received by it, to the extent of a certainangle, which depends from the adjustment of the spiralspring 55, spring45, weight of the parts, etc. At

the same time, the current between the brushes 59 and the plate 58(Fig. 1) will be cut ofi and therefore the current in the right circuitwill also become out 01f; whereupon the right armature of thehereinafter described electro-magnetic engine will be withdrawn and willcatch a tooth of the ratchet wheelwith its pawl. The left circuit, how

justed in such a way, that when the flywheel 53 turns, as mentionedabove, and, under the influence of the spiral spring, the axle 54 willoccupy the position shown in Fig. 6 again, the contacts 59 and 59 willbecome closed, the right circuit will become closed, the right armaturewill be attracted and the shaft of the motor will turn to the extent ofa corresponding angle. The next interruption of the current will occuronly during the following full turn of the key axle. An altogetheranalogous occurrence will take place in the left circuit on the rotationof the key in the reverse direction.

It is seen fromthe aforesaid that the current in both circuits is onlyinterrupted by the drum 57; the cam 7, however, dependent on thedirection of rotation of'the axle 1, causes the right or leftelectro-magne'ts of the receiving motor to be energized.

' terrupted for a very short time, that can be adjusted for the properworking of the mechanism; (2) independent of the position of the keyaxle, the electro-magnets of the motor are always energized, and finallythe same uninterrupted relation or connection always exists between thenumber of revolutions and the direction of the rotation of the key axle,on the one hand, and the indications of the counting arrangement, on theother hand, when working. The electro-magnetic motor of the receivingapparatus (Figs. 10, 11 and 12) is arranged in the following manner: twoelectro-magnets 121 and 122 with their armatures 123 and 124areinstalled on a common iron base plate 120. The armatures turn onshafts 125 (Figs. 11 and l2),-mounted on brackets 126, fastened on thebase of t as mo- 'tor. Screws 127 (Fig. 10) serve as stops for 123, 124,have lugs 131 (Fig. 12) in which are fastened the axles 132 for theratchet pawls 133 (Fig. 11), pressed by the springs 134. When thearmature is attracted, its pawl moves the ratchet wheel 135 each time adistance of one tooth. Pawls 136 with springs 137 prevents the reversemovement of the ratchet wheels. In order that the ratchet wheel 135shouldnot skip over two or more teeth by reason of inertia, andespecially when the force on the axle 138 of the motor tends to rotateit in the same direction, a pin 139 (Fig. 11) fastened to the stand 126,is provided. WVhen the armature is attracted this pin does not allow thepawl 133 to withdraw from the ratchet wheel 135, and consequently thislattercan turn at each attraction of the armature only a distance of onetooth. Bevel toothed wheels 1 10 are fastened to the ratchet wheels 135.The ratchet Wheels 135 and wheels 110 are carried freely by an axle 138mounted in bearings of the bracket 126 and are prevented from movinglongitudinally by the flange of the bracket 126 on one side and thebushing of the transverse axle 141, connected with the axle 138, on theother.

Two small gear wheels 1 12 are mounted on the ends of the transverseaxle 111 and each coupled with the two gear wheels 1e10, in a mannersimilar to that previously proposed for known signal transmitting andindicating apparatus.

As described above, on the rotation of the key axle 1 an opening orclosing takes place in one or other of the circuits of the wind ing ofthe electro-magnets 121 or 122 and when one armature is retracted theother remains attracted. The pawl 133 of the re tracted or workingarmature will turn its ratchet wheel each time a distance of one toothand the bevel wheel 140, connected with it through a correspondingangle. The small bevel wheels 142 must rotate owing to this, but as theopposite bevel wheel 140, with its ratchet wheel, remains stationary thewheels 1A2 are therefore forced to roll over the stationary gear wheel 110, and the axle of the motor 138 will rotate.

The chief principle of the arrangement of the electro-magnetic motordescribed is, that at the time when the apparatus is operated,

the electro-magnets must be energized or under current practically allthe time, the current being interrupted only for the shortest possibletime required for the proper action of the system. Therefore, in orderto avoid the use of coils of large dimensions, the windings should befed, at the time when the armatures are attracted, with the weakestpossible current. It is necessary at the same time to give a motor amaximum power with the given dimensions and for this it is necessary tofeed the windings of the electro-magnets with a powerful current,especially when the armature is in its extreme withdrawn position.

The construction of the electro-magnetic motor, described above,provides for these two extreme conditions in the following manner:Stands 113 are fastened to the base of the motor 120 (in Figs. 10 and 11one stand only is shown and that for the right electric magnet; inpractice a similar one would be provided for the left one). Axles 111are fastened on them, on which levers 110, 110 are mounted havingcontacts 117, 117 on their upper heads, inserted in holders andregulated by means of screws with nuts 106. The lower ends of the levers110, 110 have an insulation 114. The spring 115 forces the contacts 117,117 to press upon each other and the spring 116 helps to control themovements of the levers.

The armatures have cams or arms 88 of insulated material, fastened tothem with screws 107. The cams are provided with screws 108 adjusted bynuts 109.

Each coil of the electro-magnet consists of twowindings; a thick one 71or 76 (Fig. 1) and a thin one 75 and 77. As seen from Fig. 1, the thinwindings are connected respectively with wires 35, 37 and 36 constantly.The thick windings, however, are only brought into circuit by means oflevers 110. At the time when both the armatures are attracted (positionshown in Fig. 1), the contacts 117 and 117 as well as 97 and 98, areopen, as at that time the screws 108 of the armatures press on thebranches 105 of the levers 110 and the abutments or stops 118, fastenedto the armatures 123, 12 1, bear against and tend to separate the levers110, 110 so that contacts 117 do not touch the contacts 117 and thethick windings of the electromagnets are switched out. Theelectro-magnets 121 and 122 will be thus magnetized by a weak current intheir wind ings; but such suffices as the distance between the cores ofthe magnets and the armatures will be a minimum one in this position andthe electro-magnets will inherit sufiicient power for holding thearmatures in an attracted condition and for stopping or locking the axle138 of the motor. At the same time the consumption of current and theheating of the winding will be minimized.

As soon as a breakage of either of the circuits takes place thecorresponding armature will be withdrawn by its spring from theelectro-magnet. On the subsequent closure of the circuit the currentwill pass into the thick, as well as the thin windings, as the contacts117 and 117 will be in con tact. The power of the electro-magnets willthen be a maximum one (with the given conditions of construction) andthe armatures will also be attracted with maximum power. Attracted bythe cores of the electro-magnets, the armatures will cause thedisconnection of the contacts 117 and 117 again and the thick windingswill thereby be excluded from the circuit.

The whole system described may be used for direct current of anyvoltage. If the distances between the transmitting and receiving'devices be large and if it be not desirable to have longlengths of wiresunder working current, it will be easy to connect the key of thetransmitting device with relays installed at each receiving device. Thenthe transmitting device can work along with the relays of the receivingdevices with a weak current and the relays can work with the motors ofthe receiving devices with the aid of local current of desired voltage.

The diagram shown in Fig. 13 (a part of which is shown in Fig. 13 to alarger scale) shows such an arrangement, the same figures being used toshow the different parts, as in Figs. 1 to 12. tions, in this case, inthe key of the transmitting device as compared with diagram shown inFig. 1, which are as follows :-T.he drum 57 in Fig. 1 must be ofinsulated material; in Fig. 13 it is of metal, but insulated on itsaxle. In Fig. 1 the bushings 58 are of metal; according to Fig. 13 onebushing 58 is required, but it is to be made of insulating material.According to the diagram in Fig. 1 it is necessary, that the plates 9and 10 should be in contact with the plate 8, when the key is notoperated or working and should be disconnected by the cam 7, dependenton the direction of rotation of the key axle. According to the diagram13 the cam 7 must be located outside the plates and, dependent on thedirection of rotation, must press the plate 9 or 10 to the plate 8.According to the diagram Fig. 13, three wires 35, 37 and 150 run fromthe device A. The receiving devices are connected in parallel by meansof wires 178, 181 and 183. The circuit is fed with current oflow-voltage but is usually without any current.

The wires 178, 181 and 183 connect with the clamps 176, 151 and 177(Figs. 13 and 13") respectively on the relay. The armatures of therelays 188 and 186 are fastened to the plate 155 rotating about the axle154: and held in proper position, as shown in Fig. 13 by the springs 181 and 185, abutting against the rigid parts of the relays 186 and 187.The plate 155 has contacts 156 and 159, which touch the rigid butspringy contacts 158 and 161. As it is easily seen from the diagram inFig. 13, both the electro-magnets of the receiving device have theircoils under current and the armatures attracted when there is no currentin the circuit of the transmitting device (3537150) Dependent on thedirection of rotation of the key of the transmitting device during theoperation of the latter one of the coils of the relays 152 or 153 willbecome magnetized and the corresponding armature 189 or 188, will beattracted. in view of which fact one of the contacts 156157 or 159160will be closed. The motor will There are certain modificathen workexactly as has been described in connection with diagram Fig. 1.

Fig. let shows anexample of the automatic transmission of indications toa distance, for instance the positions of a rudder. Of course, in thiscase also the system with relays may be applied, but in Fig. 1 1 a caseis shown when the transmission from the transmitting device is effectedalong two wires, making use of an existing wiring, for instance forelectric lighting (the current being supposed to be direct).

In Fig. 14, 191 represents the axle of a rudder and 190 a sectorfastened to it, rotated by an endless screw 192, the axle of which restson bearings 19a and is rotated by a motor 195 of some suitable kind. Theother end of the axle 193 of this motor is connected directly or bymeans of a suitable mechanical transmission 196 to the axle 1 of the keyA. The mechanical transmission must be calculated in such a way that theaxle of the key should make one revolution corresponding to onegraduation of the de sired accuracy of the indication of the position ofthe rudder. The construction and arrangement of the key is the same, asdescribed aboveand explained with reference to Fig. 1, only instead ofthe source of electricity 70 the wire 68 is connected with the wire 165of the existing general net-work of wiring. plates 9 and 10, which wireslead to the clamps 168, 169 on the wires 170, 171, to which areconnected in parallel by means of clamps 172, 173, and wires l74, 175,clamps 78 and 91, shown in Fig. 1. The clamps 82, however, are connectedwith the wire 166 of the net-work of the existing wiring mentionedabove.V A

The action of the transmitting device A and the receiving devices B, G,D, and E are altogether similar to that described above in connectionwith Fig. 1.

What I claim and desire to secure by Letters Patent is: p

1. In an apparatus of the character described the combination of anelectro-magnetic motor located at a receiving station, an indicator atsaid station operated by said motor and comprising two electro-magnetsand their armatures for controlling the shaft of said motor, and meanswhereby when the said armatures are held in an attracted position toretain the shaft in a normally locked position the coils of the magnetsare under the influence of the weakest possible current and meanswhereby when the shaft is to be turned by reason of the attraction ofone of the said armatures from a retracted position the coil of thecorresponding magnet which causes the retraction of the armature isinfluenced by apowerful current.

2. In apparatus of the character described Wires 35 and 37 run from thethe combination of an electro-magnetic motor located at a receivingstation, an indi cator at said station operated by said motor andcomprising two electro-magnets and their armatures for controlling theshaft of said motor, means whereby when the said armatures are held inan attracted position to retain the shaft in a normally locked positionthe coils of the magnets are under the influence of the weakest possiblecurrent and means whereby when the shaft is to be turned by reason ofthe attraction of one of the said armatures from a retracted positionthe coil of the corresponding magnet which causes the retraction of thearmature is influenced by a powerful current, a pawl carried by eacharmature, ratchet wheels loose on the motor shaft and engaged by saidpawls, a bevel wheel carried by each ratchet wheel, bevel wheels mountedon a transverse shaft and engaged by the first mentioned bevel wheels inthe manner de scribed, and connections between the bevel wheels on thetransverse shaft and the motor shaft, all as and for the purposesspecified.

3. In an apparatus of the character described the combination of anelectro-magnetic motor located at a receiving station, twoelectro-magnets and their armatures for controlling the motor shaft, anindicator at said station operated by said motor, a transmitter deviceembodying a body portion, a rotatable shaft carried by the body portion,a disk on "said shaft, a cam oscillatably mounted on the disk, threespring strips carried by the disk and insulated from each other and fromthe disk but being in electrical contact with each other, said contactbeing adapted to be broken by the cam in the manner described, ringsinsulatably mounted on the aforesaid rotatable shaft and insulated fromeach other, wires connecting said rings with the said strips, springblades contacting with the said rings and being iusulatably carried bythe said body portion and also insulated from each other, a pivotallymounted lever on the body portion of the transmitter device, a weightcarried at one end of the lever, a. spring acting upon the other end ofthe lever to draw said end downwardly, a spring-actuated shaft, afiy-wheel thereon, a tappet on the fly-wheel and adapted to actuate thesaid pivotally mounted lever, a drum of insulating material 011 thespring-actuated shaft, a metallic plate on said drum, contact brushesbearing on the drum, spring plates carrying said contact brushes andinsulat ably carried by the aforesaid body portion, electricalconnections between the lastmentioned spring plates and the windings ofthe eleotro-magnets of the motor, electrically-actuated means controlledby said transmitter device for retaining the shaft or the said motor-ina normally locked position and said locking means being adapted tounlock the motor shaft on the transmission of an electric impulse andimpart to the said motor shaft during one complete turn of the shaft ofthe transmitter a definite angular movement, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JACOB PEREPELKIN.

l Vitnesses H. A. Loonaeornn, A. N. Tscrrnnnnorr.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

